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"three generations" is correct and can be used in written English.
You could use it to talk about a family line, for example, "For three generations, the Smith family has been living on this farm."
Exact(60)
Three generations back.
The problem spans three generations.
Three generations on".
The First Three Generations.
Three generations of suffering.
Her voice resounds, three generations on.
"Are you three generations' Greek?" he asked.
Three generations in the same family.
Three generations share the same philosophy.
They were three generations from one family.
"These artists span three generations".
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Write better and faster with AI suggestions while staying true to your unique style.
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com